<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="/assets/lib/cropper/cropper.css">
</head>
<style>
  .container {
    width: 600px;
    height: 500px;
  }

  .w200 {
    width: 200px;
    height: 200px;
  }

  .w100 {
    width: 100px;
    height: 100px;
  }

  .w50 {
    width: 50px;
    height: 50px;
  }

  .w30 {
    width: 30px;
    height: 30px;
  }

  .preview {
    background-color: #ccc;
    margin: 10px;
    /* 预览的图片溢出部分隐藏 */
    overflow: hidden;
  }
</style>

<body>

  <div class="container">
    <img src="/assets/images/sample.jpg">
  </div>

  <div class="preview_box">
    <div class="preview w200"></div>
    <div class="preview w100"></div>
    <div class="preview w50"></div>
    <div class="preview w30"></div>
  </div>
  <script src="/assets/lib/jquery.js"></script>
  <script src="/assets/lib/cropper/Cropper.js"></script>
  <script src="/assets/lib/cropper/jquery-cropper.js"></script>
  <script>
    // 1.1 获取裁剪区域的 DOM 元素
    let $image = $(".container img");

    // 1.2 配置选项
    let options = {
      // 纵横比
      aspectRatio: 1,
      preview: ".preview",
    };
    // 1.3 创建裁剪区域
    $image.cropper(options);
  </script>
</body>

</html>